Motor-control system



Patented Got. 3, 1922.

UNITED. STATES Pa'rr-u'rfv OFFICE. e*

BASCUM O. AUSTIN, or WILKINSBUEG, PENNsYnvANIi-rnssIoNoE To WESTINGHOUSEELECTRIC & MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA..

MOTOR-CONTROL sYsTEM.

Application 4filed November 12, 1920. Serial No. 423,544.

To all whom t may concern:

Be it known that I, BAsoUM O. AUSTIN,

a citizen of the United States, and a resident ot Wilkinsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a'plurality ot motors that were connected in series or in parallelrelation, which systems wereadaptableto govern the partial operation ofthe remaining motors alter one of the motors was disconnected from thesystem. According to my invention, I provide e relatively simple means`for disconnecting one of a plurality of motors from a Control system,which means is capable ot connecting the motors in bothseries andparallel relation. The meansemployed constitute a plurality ot switcheswhich are adaptable to so change the connections of a control sys' temthat, although one of the motorsfis dis connected from the system, amaster coni troller may be safely and eifectively notched through allits positions. e

F or a better understandingl ot my invention, reference should be madeto the accom-` panying drawing;

Figure 1 of which is a schematic view of a motor-control systemembodying my invention.

Figs. 2 and 8 are views in plan and in side elevation, respectively, ofa structure comprising a plurality of switches that are I utilized *inthe control system shown in Fig. 1.

Fig. 4- is a chart, of a well-known form, showing the sequence ofoperation ot the contactors that are employed in the control systemshown in 1. e

Referring particularly to Figs. 2 and 3, a

in series and in parallel lplurality of manually yoperated doublethrow,knife-blade switch members `1, 2 and' 3 are pivotally mounted onaninsulating base member L1. lmite-blade switch inembers 1 and 2 areprovided with insulating cross-members or barriers 5 which are adaptedto sointerlock with an insulating cross-member or barrier 6 of theswitch member 3 that the latter will be actuated from its normallyclosed or upper position if either switch member l or `switch member 2is actuated from its upper position.

The switchmembers 1, 2 and 3 are pro vided with central contactterminals or hinge studs 7, 8 and 9, respectively, and may be actuatedinto engagement with upper contact terminals or `jaws'11, 12 and 13, and

lower Contact terminals or jaws 14, 15 and 16, respectively. It is`impossible to actuate either of the outer knife-blade switch members 1or 2 into lower position, corresponding to jaws 111 and 15,respectively, unless the central knife-blade switch member v6 oc-`cupies its lower position, corresponding to jawl. Referring to Fig. 1,the knife-blade switch members 1 2 and 3 are employed ina control systemcomprising propelling` motors 17 and 18 oi an electric Car.v A suitablemaster controller (not shown) is provided for operating the contactorswhich control the operation ot the motors, in accordance with n .L aVfamiliar practice. l

In starting` the car, the motors 17 and 18 are energized from the'supplysource of energy, such as trolley 19, by a circuit estab-r lished`through trolley pole 21,` circuit'- brealreror line switch 28,4 seriescontactor 2l, Contact terminals 13 and 9 which are connected by switchmember 3, series ield magnet winding 25 and armature 26 oit the motor17, contact terminals 11 and 7 which are connected by switch member 1,starting resistor `22, contact terminals 8 and12 which are connected byswitch member `2, arma-l ture 27 and series field-magnet winding`28 otthe motor 18 to ground, as indicated by Fosition a in the sequencechart, Fig. 3.

Accelerating contactors 29, 31 and 32 may then be closed in successionto shunt portions oli the starting 'resistor 22, thereby acceleratingthe motors 17 and 18, as indicated in lines b, c and d of Fig. 3..'

ioe

After the starting resistor 22 has been shunted, the motors 17 and 13are connected in parallel relation by actuating the master controller tothe next running position e, thereby closing the contactors 33 and 34,after opening contactors 241, 29 and 31.

A circuit is thereby established Yfrom the circuit-breaker 23 throughparallel contacter 33, portions of resistor 22 iii parallel ielation andaccelerating contactor 32, contact terminals 7 and 11, which areconnected by switch member 1, armature 26, series field-magnet winding25 of motor 17, and contacter 34 to ground.

A second circuit is also established through Dortions of the startingresistor 2G in parallel relation and accelerating contacter 32, contactterminals 8 and 12 which are connected by switch member 2, armature 27,and series Held-magnet winding 23 ot the motor 18 to ground. The motors17 and 13 are then accelerated by the i. ontactors 31 and 29 ciosing inthe order namen, as indicated in positions ,t and g of 3, therebybringing 'Llie motors to full speed.

It', for any reason, it is considered necessary or desirable to renderthe motor 17 inoperative, switches 1 and 3 are thrown -from their upperposition to their lower position and the controller operated in the samenianner as before. The operator is required to employ but one hand toactuate the switch members 1 and 3, as the switch member 3 will beactuated by the barrier 5 oit the switch 1.

Then the next start is made, the` motor 13 is energized by a circuitfrom circuit breaker 23 through series contactor contact terminals 1 1and 7, which are connected by switch member 1, starting resistor 22,contact terminals 3 and 12, which are connected by switch member 2,armature 27 and Yri field magnet winding 23 oft motor 1h to ground. i

Motor 18 is then accelerated by contactors 29, 31 and 3l closing in theorder named, which is the same order as when motors 1li' and 18 areoperated together.

It the master controller is actuated beyond position d, corresponding tofull series conn nection, series contactor 2/1 and acceleratingcontactors 29v and 31 open and parallel contactor 33 and groundcontacter 31 close, thereby establishing a circuit from circ iit breaker23 through parallel contactor 3S portions of starting resistor 22 inparallel relation and. accelerating contacter' contact terminals 8 and12, which are bridged by switch member 2, armature 27 and series fieldmagnet winding 23 of motor 18 to ground.

lThe motor is again accelerated by contactors 31 and 29 closingsuccessively, thcreby completing the sliunting of the starting resistor22.

it is desired to operate the motor 17 without operating the motor 13,switches 2 and 3 are moved 'trein their upper to their lower positionsby the operator actuating the handle o1 switch 2, and swch 1 is lelt inits upper position.

. i ed by contactors 29, 31 and 32 nofnng in the order named.

lt the controller is operated beyond he series positions to the paralelposi" circuit is established V4"oin cii'ciilit through parallel constarting resi i; 22 accelerr ying contador ff i and vshun ,i

member 1, armature 2 net finding 25 ot to ground.

lie motor 17 is 'iuther acceler:iter-L contactorf: 31 and 29 beine'closed in s ,y sion.

.From the alioi'e description is afroarcnt that no change need be uiudein. the mister controller which governs 'if-Jiri' the cci'itactors 21,2S), it is desired to disconnect from the control s3., ,i tactors mayclose in the s i the complete fzeipience when 17 or the motor 1b isoper-u there'lfore, only necessari' to actuate the switch nviuhers 1 and3 from their upper to their iov positions lo disionnect or cut out thein Lez' li' 'ifroiu tue ic mainder o'ii the rent-ol sf. t su. or to:lctualje the lqii'iie-blaulc su" G and series neu motor 1'1' and`contar.' 1

itches 2 .zuil from ifi upper to their tower pesitions lo ,isccuiui i'the motor 13 from the rcniziindcr o1 the control system.

The 'auriose of interlockine the f 1 and 2 with the swit h 3 is to nproper circuits being tonned b r @e lnii cblade switch 3 remaining inits upper posiblade switch 1 or tion when either the lnn the switcn 2 isactuated i in its upper lower position. The indie-blade swn 1, 2 and 3,being independent oit the raster controller, may be positioninl somedistance therefrom, as convenience requin-es.

Wliile l havel shown my invention in a preferred i'iorin, it is:ujparcnt that minor modifications may be made in the arrangement ofapparatus and circuits without de- 2. In a control system, thecombination' with a plurality of dynamo-electric machines, a resistortherebetween, and a plurality of contactors for connecting said machinesin series and in parallel relation, of`

means for accelerating said machines through a complete cycle, and meanscomprisingy a plurality of switches for disconnecting any one of saidmachines without preventing the operation of the remainder of saidmachines through said cycle.

3. In a motor-control system, the combination with a plurality ofmotors, a resistor therebetween, and a plurality of contactors for*connecting said motors in series and in parallel relation, of means foraccelerating said motors and means for selectively operating said motorsthrough the same cycles.

il. In a motor-control system, the combination with a plurality ofmotors, a resistor therebetween, and a plurality of contactors forconnecting said motors in series and in parallel relation, of means toraccelerating said motors and means comprising a plurality of switchesfor selectively operating said motors through complete cycles..-

5. In a motor-control system, the combination with afplurality of motorsandra plurality of contactors for connecting said motors in series andin parallel relation, of means comprising a startingresistor connectedbetween said motors or accelerating said motors operable throughoutacertain range upon said motors being connected in series or in parallelrelation, and means comprising a plurality or" switches fordisconnecting one of said motors without preventing the operation of theremainder of said Amotors by said accelerating means throughout saidrange.

6. In a motor-control system, the combination with a plurality ofmotors, and lstarting resistor connected between said motors, of aplurality of contactors for operating said motors, said contactors beingcapable of shunting successive portions of said resistor and ofconnecting said motors in series and afterward in parallel relation, andmeans comprising a plurality of switches for operating a lesser numberof said motors through the same cycle as before when an inoperativemotor is disconnected from said system. i

7; In afmotor-control system, the combination with a plurality of motorsand a plurality of contactors for connecting said motors in series andin'parallel relation, ot a star ing resistor connected between saidmotors, a controller for governing the sequence of operation of saidcontactors, and means for selectively operating said motors withoutchanging the sequence of operation of said contactors.

8. In a motor-control system, the combination with a plurality of motorsand a resistor therebetween, of a plurality of contactors :torconnecting said motors in series andin parallel relation and for varyingthe active value of said resistor, a controller for governing theseqence of operation of said motors, and means comprising a plurality ofswitches for selectively operating said motors without changing thesequence of operation of said contactors.

9. In a motor-control system, the combinationy with a plurality ofdynamo-electric machines normally adapted for joint operation and aresistor connected therebetween, of means for `operating one of saidmachines through the normal cycle.

l0. In a motor-control system, the combination with a plurality ofdynamo-electric machines normally adapted for joint operation and a.resistor `.connected therebetween, of means for operating either ofsaid machines through the normal cycle.

ll. In a control system, the combination with ,a plurality ofdynamo-electric machines, a resistor connected therebetween,

and a plurality of contactors for connecting said machines in series andin parallel reati'on, of means for acceleration said machines through acertain cycle, means for disconnecting one of said machines withoutpreventing the operation oi the remaining machines through said cycle,and means for preventing improper circuits from `being established bysaid contactors.

l2. In a controlsystem, the combination with a plurality ofdynamo-electric machines, a resistor connected therebetween, and aplurality oi contactors for connecting said machines in series and inparallel relation, of means 'for accelerating said machines through` acertain cycle, means :tor disconnecting one of said machines withoutpreventing the operation or" the remaining machines `through said cycle,and means comprising a switch for preventing improper circuit from beingestablished by said contactors.

In testimony whereof, I have hereunto subscribed my name this first dayofNovemlll)

